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680 Chesapeake Drive Redwood Ciry CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1%07Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler RyanyGeostrategles Client Prol ID _ Unocal SS#0123 Sampled 09/28/98 <br /> 6747 Sierra ourt Suite J Sample Descript U-2 Received 09/28/98 <br /> ' Dublin, CA 94568 <br /> Matrix LIQUID <br /> Analysis Method EPA 8260 Analyzed 11/03/98 <br /> Attention Deanna Harding _ Lab Number 98491-150-03 _ Reported 11y10198 _ <br /> QC Batch Number MS110298MT6EH6A - - - - - - - Y-�- - - -- - _---- - µ --- <br /> Instrument ID H6 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> Ethanol 500 N D <br /> t-Butanol 100 N D <br /> Methyl t-Butyl Ether (MTBE) 20 N D <br /> Dl-Isopropyl Ether (DIPE) 20 N D <br /> Ethyl t-Butyl Ether (ETBE) 20 N D <br /> t-Amyl Methyl Ether (TAME) 20 N D <br /> Surrogates Control Limits % % Recovery <br /> 1,2-Dlchlorcethane-d4 76 114 98 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> qpdGran—icher <br /> roject Manager Page 10 <br />